Prince Charles, Queen Elizabeth welcome guests out for pre-wedding dinner

Prince William's grandmother, Queen Elizabeth, welcomed VIP wedding guests at a Thursday (April 28) pre-wedding reception at London's Mandarin Oriental Hotel. It was a parade of royals as HRH welcomed her regal counterparts from overseas.

Guests included Prince Pavlos of Greece and Princess Marie-Chantal, Queen Sofia of Spain, Prince Felipe and Princess Letizia of Spain, Queen Margarethe of Denmark, Crown Prince Alexander of Serbia and Princess Katherine, the Grand Duke and Duchess of Luxembourg, King Harald of Norway and Queen Sonia.

Less than a mile away, according to The Press Association, Kate Middleton and her family were safely tucked in at the Goring Hotel in London's Belgravia neighborhood.

Prince Charles and Camilla Parker Bowles arrive:

Prince Pavlos of Greece and Princess Marie Chantal of Greece were on hand to attend the gala:

As of 3:55 a.m. ET, guests were already filing in to London's Westminster Abbey. Stay tuned for continuing coverage!